Telegraph receiving instrument.



c. ADAMS-RANDALL. TELEGRAPH RECEIVING INSTRUMENT APPLICATION FILED NOV. 28 191.6- 1925 %y%32o Patented Jan. 22,1918.

CHARLES ADAMS-RANDALL, or nos'r on, ivinssaonnsn'r rs, assrenon T0 ELECTRICAL rnvniv'rrons COMPANY, or BOSTON, MASSACHUSETTS, A CORPORATION.

TELEGRAPH RECEIVING INSTRUMENT.

Specification of Letters Patent.

Patented Jan. 22, 1515.

clear, and exact description of the invention,

such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to telegraphic receiving instruments and has for its ob ect, without the aid of relays, to provide a means 7 for augmenting the received signals and rendering them more clear than has been heretofore possible.

lVith this and other objects in view, the invention consists in the novel details of construction and combinations of parts more fully hereinafter disclosed and particularly pointed out in the claims.

Referring to the accompanying drawings forming a part of this specification, in which like numerals designate like parts in all the views 2- Figure 1 is a diagrammatic partially sectional View in plan of a telegraphic receiving instrument made in accordance with this invention;

Fig. 2 is a side elevational view of the part shown in Fig. 1;

Fig. 3 is a slightly modified form of the invention wherein the sounding lever is provided with the adjustable screw stops shown;

Fig. 4 is a diagrammatic plan view partly in section of a still further modified form of the invention;

Fig. 5 illustrates a side elevational view of the parts shown in Fig. 4; and

Fig. 6 is a detail sectional View of a still. further modified form of the invention.

1 indicates any suitable base, 2 any suitable electro-magnets joined in the main line circuit 3, provided with the main line battery 1 and provided with any suitable signaling means 5.

6 indicates an armature for the magnet 2 provided with the spring 7 and the pivots 8 mounted on the bracket 9. In Figs. 1, 2 and 3, the armature 5 is rigid with the sounding lever 10, and the latter is provided at its extreme end with the sounding hammer 11, as

shown. Mounted at suitable distances from the sounding hammer 11 are the diaphragms or other sound amplifying devices 12 and The diaphragm 12 is made of a larger diameter than. the diaphragm 13, and its sound chamber 1%, located inside the box 2-1, may be removably provided with the amplifying horn or megaphone 15, as illustrated.

The smaller diaphragm 13 is preferably provided with the contacting dampening springs 16 and the box or frame work 17. Associated with said frame work is the extension 18 surrounded by the spiral spring 19, said extension passing through the up right or bracket 20 and provided with the adjusting nut 21 adapted to move the said frame work 17 and diaphragm 13 toward and from the sounding hammer or anvil 11.

The magnets are conveniently provided with the adjusting member 25 surrounded by the spiral spring 26 and may be adjustably moved to and from the armature 6 by means of an adjusting nut 27, as will, be clear from Fig. 1.

In the somewhat modified form of the in vention shown in Fig. 3, the adjusting screws 30 and 31 are located on each side of the sounding lever 10 so as to limit its motion in a manner well known, and the other end of said lever 10 is provided with the spring like portion 82 in order to permit the sounding hammer 11 to be operated by said spring 32, all as is well known to those skilled in the art.

In the still further modified form of the invention shown in Fig. 4, the magnet 50 is provided with a hollow core 51 adapted to receive the plunger 52 carrying the armature 53 provided with the connecting means 5-1 through which passes the pin 55 connecting said means 54: with the sounding lever 10 as illustrated. The said sounding lever is pivoted as at 56 to the bracket 57 and a spring 58 is provided for returning said lever and armature 53.

In the still further modified form of the invention illustrated in Fig. 6, the sounding lever 10 is provided with the spring 7, as in Fig. 1, which is pivoted as at 60, and loosely passing through said lever 10 is the screw threaded plunger 61 provided with the nonmagnetic contact nuts 62 and 63 located on opposite sides of said lever 10. Rigid with the plunger 61 is the armature 64 adapted to be attracted by the core 51 of the magnet 50.

In'all the forms it will be observed that the sounds or signals which would ordinarily be given by the striking hammer 11 are augmented through the action of the diaphragm l2, sounding chamber ll and megaphone or horn 15, although only the normal movement of the armature 6 is had.

It will be further seen that owing to the fact that the diameter of the diaphragm 13 is different from the diameter of the diaphragm 12, a different sound will be emitted by the said diaphragm 13 from that emitted by the diaphragm 12, and therefore, the 0perator may readily contrast the two sounds and thus distinguish between very feeble signals. In other words, when dots and Clashes are struck on the diaphragm 12, sounds of a certain pitch will be emitted, but

' between each signal there will be received a contrasting sound or signal having a higher pitch from the diaphragm 13 which will enable one to' distinguish the said dots and dashes on the diaphragm 12 in a manner more clearly than would be the case were the diameter of the diaphragm 12 the same as V the diameter of the diaphragm 13.

The eflicient operation of the instrument is greatly facilitated by the fact that the diaphragm 13 may be adjusted through the screw means 18 and 21, to the position at which the sounds can be the most clearly distinguished. When the sounds received on the diaphragm 12 are unusually faint, the same are rendered more distinct by placing the ear to the horn or megaphone 15, and this fact combined with the fact that the movement of the striking hammer 11 is greatly amplified over that of the ordinary telegraph sounder, makes it clear that with this instrument one can do away entirely with the ordinary relay and local circuits which are commonly used in telegraph lines.

In addition to the above, in the form shown in Fig. 6, the sounding lever 10 is nor mally free to act and it is so arranged that when the armature 64 is attracted, the 0011- tacting nut 62 forcibly strikes said lever 10 and thus not only greatly augments the movement of the striking hammer 11' over the movement of the said armature 64, but the contact itself produces a sound which can be picked up by the ear of the operator and thus furtherenables him to distinguish very faint signals.

In other words it will be obvious that I i two diaphragms 12 and 13 of different diameters or resonance adapted to be alternately acted upon by said striking means in its forward and backward movements.

What I claim is: i

1. In a telegraphic apparatus the combination of a main line; a magnet provided with an armature in said main line; a sounding lever provided with a striking hammer adapted to be operated by said armature; a fixed diaphragm adapted to be struck by said hammer; and an adjustable diaphragm of a different diameter from said fixed diaphragm also adapted to be struck by said hammer and to produce difierent contrasting sounds, substantially as described.

2. 111 a telegraphic receiving instrument the combination of an electro-magnet; an armature for said magnet; a sounding lever actuated by said armature, provided with a striking hammer; a pair of diaphragms of diiferent diametersadapted to be alternately struck by said hammer, one of which is fixed and the other adjustable to and from said hammer, the latter diaphragm being provided with dampening springs; and means to move said adjustable diaphragm to and from said hammer, substantially as described.

3. In a telegraphic receiving instrument disconnected from but adapted to contact with and to be actuated by said armature and provided with a striking hammer; a pair of diaphragms of different diameters adapted to be alternately struck by said hammer;

and means to adjust one of said diaphragms to and from said hammer,

described. p

In testimony whereof I in presence of two witnesses.

CHARLES ADAMS-RANDALL.

Witnesses:

GEORGE H. TAMLYN, FREDK. PERRIE. I

substantially as Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. 0.

my signature, 

